Signaling system



A. E. LUNDELL AND E. H. CLARK.

SIGNALING SYSTEM.

APPLlCATlON FILED MAR. 30. |917.

Patented Aug. 12, 1919.

SHEETS-SHEET l.

ZSHEETS-SHEET 2.

PatentedV Aug'. 12, 1919.

SlGNLlNG SYSTEM.

APPLfCATmN FILED MAH. 30. 1917.

A.V'E. LUNDELL AND E. H. CLARK.

A. E. LUNDELL AN'D E. H. CLARK.

SIGNALING SYSTEM.

APPLICATlON FILED MAR. 30. 19|?. 1 ,3 1 2,79 1 A Y Patented Aug. 12,1919.

\ SHEETS-SHEET 3.

yf -Affy A. E. LUNDELL AND E. H. CLARK.

SIGNAUNG SYSTEM. APPLICAON FILED MAR.30.1911. u 1,312,791. PatentedAug.12,1919.

' ZSHEETS-SHEET 4..

@SES

A. E. LUNDELL AND E. H. CLARK.

-SIGNAL'ING SYSTEM. APPLICATION FILED MAH. 30. 1911.

l,312,791. Patented-Aug. 12,1919,

7 SHEETS-SHEET 5.

A; E. LUNDELL ANDE. H. CLARK.

SIGNALING SYSTEM. A'rPLlcATsoN FILED MAR. ao. |911.

PatentedAuol. 12, 1919.

'Aff A. E. uuNDELL' AND E; H. CLARK.

SIGNALING SYSTEM.

AP PL1CAT!0N FILED MAR.30.1917.

Patented Aug. 12, 1919.

TSHEETS-SHEET 7.

//7 Ve/f /0/15. /l/e/v E ande/ Edgar/ Var/f.

ALBEN E. LUNDELL ANI) EDG- AB H.l CLARK, OF NEW YORK, N. Y., ASSIGNORSTO WEST- EBN ELECTRIC Gontran-Y, 1NoeaPonA'rED`,1or New YORK, n. Y.,

OF NEW YORK.

Specification of Letters Patent.

SIGNALING SYSTEM.

Patenten nag. i2, reis.

.Application-med March 30, 1917. Serial No. 158,589.

in Signaling Systems, of which the following is a full, clear, concise,and exact description. i This invention relates to signaling systems andmore particularly to signaling systems employed in telephone systems.

It is the object of the present invention to provide means forselectively operating a plurality of signals in response to theoperation of an impulse transmittingdevice which 1s arranged to transmitcombinations of iiniilses varying in duration, order and num- Anotherfeature of this invention is the automatic'selection of signalingcurrent by means of impulses of various characteristics Figures 1 to 7of the drawings, when arranged in accordance with the chart indif catedin Fig. 8, diagranimatically represent a portion of a telephonesystememploying the present invention,

In the system herein disclosed the appa- Aratusl associated with an Aoperators position of a semi-automatic exchange andthe apparatusassociated with the B operators position of a manual oiiice areshown. It

i will be understood that only those parts are shown which are necessaryfor describing the establishment of Va desired connection from a callingsubscriber at A to the jack of a party line B.

In. the present system the sequence switches, with the exception ofsequence switch 500', are of the type disclosedin the patent to Reynoldsand Baldwin 1,127,808, and are similar in operation and function tothose disclosed in the patent-to McBerty 1,125,579. The sequencev switch500 is referred toas a step-by-step sequence switch a comonn'rron and issimilar in structure to the above-nienh 1" tioned switches except thatit is driven by an impulse-controlled motor magnet instead of by aconstantly driven power shaft. The

switch 500 is advanced only upon the denergization of its operatingmagnet, or, inother words, on the` return stroke of its armature.

beof the type disclosed in patent to Craft and Reynolds 1,123,696. Theoperating cir cuits for these switches are shown in the patent toLuiidell 1,168,3`0..

In the present disclosure, registers, controlling devices and actuatingrelays are eniployed. The operation of these devices, eX-

cept in so far as thev are necessary for a clearunderstanding of thisinvention, has -not been described. This operation is fully described inthe above-mentioned patent to 'Liiiidell 1,168,319.

It is believed that, the invention .will best be understood bydescribing the manner-of establishing a connection from `the callingsubscriber, whose substation is indicated at A, -to the B operator, themethod of indicating to the B operator the number of the desiredl line,and the method in which selective i rl`he selective switches of thissystem may ringing current is applied to the called line.

When the calling subscriber removes his vreceiver from theswitcliliook,theline rela); f?

102 is actuated in tie well-known manner to light the lamp 103. Theoperator, en noting the lighting ofI damp 103, inserts plug 104 in jack105 of the calling line. A circuit is thereupon completed from groundedbattery, winding of cut-olf relay' 106,-sleeve-of jack 105, sleeve ofplugv 104, winding of relay '107, to ground. The relays 106 and 107 areenergized over this cir- A2, a circuitis completed from grounded bat--ltery, magnet of sequence' switch 200,- con-v tact 202, conductor 20B,Contact 109 to zirive magnet 2G1- eontrols the elevation of `fee eorillindert generally designated, L0?. le soon es lie brush 208 of the oordfinder 20? is terminal :209 associated with 'ille crd circuit. which hasbeen oonneoteri "nu ne selling line, the relay Q06 is energized over ueircui which may be traced from grounded battery, winding of relay 20G,eenlne Q10, brush 208, termin-[il 209, oondne'zor 211, eoniect 110, toground. Relire' 20S @3mois iis armatures and et its left-henri.orinzinre inierrupts the opereiin eirenil of the npwlrive magnet Q04-,which eirenii was preriouslj,l described and et the right-llenozii-miliare and front. contact of relay 205 e locking circuit isestablished for tiis relegY from. grounded initier winding of relay.

20G, Contact' 291, right-inruil armature md` lfront Contact oi reloyQO,binsli lminiil 213, conductor 321i, consent, ill, io

ground, which maintains the relay 265 energized until the selectorsequence swieh i0@ has moved ont of posieion 11. At 'ille leila linedarmature and from; contest oit relay 2Go a eircuit is closed fromground, eon'eet nmfgnet oi' sequence swieli i200 to grounded battery, tomore this sequence swil'eli into position 3.-

The operator iliereuponplnoes lier ile/ae.- sof- (not shown) intelephonie eoinniiiniee tion wi'ill l'ie substation apparet-ns and eseermins from the calling siibscribertlienurnlier oi i'flie desired line.'lie operznor then .Seis up mis nusnber on lier key seit, which shown inFig. i of lie draw/ings. As soon ,ne operator lies depressed the keyslill", K4, E enrl K6., operating ei3- :girlie For *alle regisers 00,410i', 02,- ei-QB, @205: ein? 05 eoznpleieci. These registers "ionsindienteciley'iiie epressefi oiA (lie lie; Tile operating oireui ris fere200 extends from grouncie lmtery, magnet of lie register 00, righi--ininrl armature me 'Decir oonieei of seep reloj; ein: conductor 107,Contact 221, to eend. lili( operating circuits for lie i'efisilers 4.0i,i052, 4GB, 404i unal ere sinii- 'lzirlv recel liroueli ther'litelienflarmnuire und beek Contact of. tlie sion relevs 40S. 46). 410, 11 and412, respeeively, con

(iunior 407, to gronnfl at conteur, 221i. *As

s the stop relays 406, 40S, 109, e119, mil :ire energized, e.. oiromb iseoni; 'eri From rroi'lnfl 'through lie left-nenti riore and 'lirontconiaets orl 'liese rev niegue/soi betery, 'in

position 3.

Uncler fthe eoo'eroi or" its master Contact 323, seqnenee switch 200roiees ino position 6.

The fondamental circuit is nony established from grounleii 'osi-ileij',7winding of the line relay llfeontee 113, Conductor 11i, ter mina] 216,brusli 217, conductor 218, outer left-liend armature and back Contact ofthe rapper zero eonning rele-y 219, winding of the stepping relay 220,contee 2%, brush 2:25, terminal 226, conductor 227", contact 115 toground Relay 112 attracts its erinetnie and thereby completes a`looking; oirenit for itself. At the left-hand from eontuet enel.armature of relay 112 e circuit is also eonipleted to move sequenceswiteli 100 ino posiiion 3. Viitli lie sequence swieii 1Go in position 3end with the line relay 1.1.2 energized, an operating cirenit for thenpwlrire magnet 116 is eompieted .from grounded betreur, Winding ofmagret 116, eonrineior lil?, eoneo 11.8, left-henri armetnre eno frontcommet of rele-y 112 to grounfi. Under the control of the rip-drivemagnet, e, selector switch, generell? designated M9, eleretes itsbrushes and also ele- 'Viites iis eommututor brushes llend 121.

lleeli linie limi; the eommuietor brush 120 eneoinrers e eonalocringsegment 1:22 of oom.- xnutetor 1526, s Circuit in shunt of the funde.Fniente-il eireuitinst described is completed fromI ground, connnuteiorbrush 120, eon-` duetingg segmenl', 122, coni-fiers 123 and i60,"

ripghblien, nrnieture end :front von'feot of relay 1112, "winding of theline relay 112 to grounded bet'eerf', to srioi't-oireui3-tlie sten pingreiziy 220 in the well-known manner. This shor-eireniting operation ofthe stepping relay eonlinues iintil the upper zero counting relay 21.9oi1 the eiiein of relays, the length of which is determined 'by thesetting of the distrie register 400, is ectuetecl. lNlxen the relay E219ettreets its armatures, et iis outer armature end back Contact itinterrupts "die ,fundamental circuit above described, and. er its innerarme-ture .and front Contactl completes a circuit from groiincl,eontael; 228, magnet of sequence switeli 290, to grounded battery, tomore lne eequenee'switeh ont of position 6 into posiion "i,

llvliien/tlie fundamental circuit was inter-- rupted et the upper Zerocounting reluy219q the line reflef,Y 112 denergized and elzitslethandbeekfontnet and armature completed a circuit roiii ground, Contact 124,magnet of,

sequence. lswitch l0() llo grounded battery, to

.im ve this sequence switch out of position 3. lnder the control oi. itsmaster Contact 101,

sequence switch 100 continues to rotate until it reaches 'position G. Inposition 6 of i the sequence swiehf", en energizing eirenii. test releyis closed from groundefil battery, lower Winding of relu); conl'? laoground. The iest relay 125 :ittrees iis armatures and el; its lower:irmature and front contact completes a circuit from ground throughcontact 128, magnet otsequence switch 100 to grounded battery,

t more this sequence rswitch into position 7. Imposition 7 the testrelay 125 `ismaintained energized over a circuit which may be tracedfrom grounded battery, upper winding of the test relay, upper frontcon-A tact andarmature of relay 125, test brush 129 of the selector 119to ground, over the test terminals of busy trunk lines. With the testrelay 125 energized, an operating circuit for the upv-drive magnet 116is again l completed from grounded battery, winding of the magnet 116,conductor 117, contact `130, lower front contact` and armature of relay125 to ground. As soon as the test brush 129 .of the-selector 119encounters the test 'terminal of an idle line, whichl idle conditionwill be indicated by the absence ofA ground on the test terminal, thetest relay 125 denergizes and thereby completes a driving circuit fordriving the sequence switch 100 out of position 7. This circuit may betraced from grounded battery, mag- `net of sequence switch 100,l.contact 131,

lower back contact and armature of test relay 125, to ground. Underthecontrol of its master contact, the sequence switch rotates until itreaches position 11.

-In position 7 of sequence switch 200, anoperating circuit fornovingthesequence' switch 229 outof position 1 is closed fromV grounded battery,"magnet of sequence switch 229, contacts 230, 231, to ground.

With the sequence yswitch 100 in position- 1l and the sequence switch200 in position 7, a circuit is VcompletedV Jfrom grounded battery,right-hand winding of relay 302, lcithand arn'iature and back contactofrelay 303, conductcr304, repeating coil 305, lower inner armature andback Contact of relay 301, ring conductor 137 of the trunk terminal 131,.brush 135, Contact Y136, conductor 227, terminal 226,'brush 225,contact 233, contact winding of relay 235, to

ground. The relays 235 and 302 are energized over this circuit'andattract their armatures. At the front contact and armature of the relay235v a circuit is completed from ground, contact 236, magnet of se-.quence switch-229 to grounded battery, to

move the 'sequence switch 229 out of position 2 "into position 3.

Upon the energization of thel relay 302, a circuit is completed forlighting lamp 306 after the calling line has been extended Yto V'theoperators position. The actuating circuit of lamp 306 may be traced fromgrounded battery, conductor 307, armature and front contact -of relay302, conductor 308, outermost back contact and armature of relay 309,resistance 310 to ground. The operator, on noting the lightingoflamp3,06, denresses the key 311, whereupon a cir- A grounded battery.

armature.

cuit is completed from ground, winding of relay 301, key 311, conductor312, contacts '501, 502, winding of relay 503, to grounded battery. Therelays V503 and 301 are energi'zed over this circuit and attract theirarmatures. The relay 503at its righthand armature and front contactcompletes a locking circuit for itself from grounded i battery, windingand right-hand armature and front contact of relay'503, over the conf yductor 312 to' ground, as previously described. At the left-handarmature and front contact of relay 503, a* circuit is conipletedfrom'ground,.contacts 570, back contact,- armature and winding of themagnet of the step-by-step sequence switch 500, to

that this sequence switch is advanced only upon the denergizationof itsmagnet, or in other werds, on the return stroke of its The magnetattracts its armature which interruptsthe operating circuit to move thesequence switch into position 2.

When relay 301 attracted' its armature, the circuit of relay v235(Fig.'2) was eX- tended from the ring-conductor 137 to the conductor313, but since this conductor was It will bev remembered open at contact508, relay 235 denergi'zes,V to remove the sequence switch 229 out ofposition 3 through its various positions to normal.

When relay 301 attractedits armatures, a

circuit was established from grounded battery, winding of the relays 506and 510, Vcontact 509, conductor 314, inner front contact andupper-armature 'of relay 301, conductor 138, terminal/ 139, brush 132,contact 133,

ico

conductor 114, terminal 216, brush 217, conductor 218, contact 232, toground. The relays 506 and 510 attracttheir armatures and relay-506 atits louter back-contact and armature completes the energizing circuit ofthe -magnet4 oflsequence switch 500. However,

the energizing `circuit of relays 506 and 510 is almost immediatelyinterrupted at contact 232, and these relays denergiz@I to move setion 4a circuit was completed from ground'l magnet of sequence switch 200,

ed battery, contacts 270 and 271 to ground to move this sequencesequence switch into position 8. While tlie sequence switch 229 isrotating through its various positions in proper sequence, it closes itscontacts (shown-at the right-hand corner of Fig. 2) to control thetransmission of the impulses which canse ns mitomsti seis@ -tion of thepmpsr ringing currsn o h@ desired subscriber on thg 'party ins, smi ais@transmits impulses fr assuming the pimps? group of eisys which @simi chesettings? of whs desired vsfbsciiisss nnmbsi. ,The charats' of theseixipusss is cesiois ths'isngth of einsam of iie si ssqnence switch 229.impnissso ihres diffu ent characters may be transmi-ed im ti and ying@audaci-ors o @he seiecmi tsm-iii. Tiss@ in'apnises may be desciibs sslong, siisr and medium in iengili. Fm" cnw venamos, ik@ iong impuissina-y 'ss ssi@4 ssnsist ssiy, midfiie and s isis aissui's the cnntmtsisaing t@ the ip of fing ductors. Tins sham impiiss may consis. sitinsvan ssi@ Y, middis or s isis ciosuis these omissis/s; wiiiie the mediumisng'sh im puise may consist-o esrij-,f and s. nii-dis nissan, or smidis sind a, ist@ closure @if dusss sont-acts. Fm-ccnvenisn in(isses-iik ing the ,ssiseion of ringing ciuisn., fsf the actuation oftha isisys which con E ijn@ setting up' of lohs issirs subsciibsiisnumbe', that-arms ssiyniddis, and Essa Wiii be used to desfeiibs thechsracsr of *Jue impnss smpisysd in opsatins.

Let it be ssmmer iis she dssiisd subn scribes number is 9987i?, Unfiezthis asr sumpj'ioi the operator in setting up tias 'nunk nar an theksyboar has caused the thi sands 'sgistsi G1 t0 Simp in pcsitmn 9, nshimdreds register 402 in position 9, ne tens feg isis? i613 in pesition8, 'me units isgistsr 404i in position 7 and the s'iations iegiser 05 inposition' 4C. in order to select die pi'opsr ringing current forsingingpsity @lis necessary to iock up the Relays A, B anzi. C of Fig.5. .To vammpiisn this, it is necessary "to transini @is foiiowing codeimpuisss; s middle impulse on the tip conduca-r, anni eariy, .middle.and ist@ impnises sn ich@ ring conuctor. With this setting 0i' En@samsns register @G5 While the sequence swich 229 is xjotzing throughpositions 113/4 to -/f, :L sircnit is `compiegmd from ground, conizsat-239, conductor 240, @Unmut '4215, conducto? l16, contacts 241, 233,brush 225, tsmins 226, conuctoi 22?, Contact 136, biusii 135, *erminai18s, ring condustor 13'?, iows'r inns1' armature and front Contact' ofrelay BGL conductor 313, contact 50S, winding of vmiziy 505, to groundedbstteiy, i/Viiie the ssquence switch 229 is missing through posi tionv 5to 5-1/4, s Circuit is Closed imm ground, Contact 242, conductm" Q43,conm-'5t 41T. nductm; 418, comincir 'zZ-i4, conductor 218, brush 21?,termiiml 216, conuctoi 1M, Contact '1.33, brush i3?, tsiminsi 'ipconductor 3,38, upper inner simntns and front @finisci of relay 301.,conductor 'iai, Contact 509', windings of isisjfs 510 and to grounriedbattmy. Wiiie, the sequence 'switch 229 is passing through pnsition 5 isl die inim l @siisctsif mrs/nini, ifs/M mail; @if @hay ansi i'isnfzsont:

the selection' of the thousands.digitv are transmitted. it* will beremembered that the thousands digit is 9. Forselecting the lampcorresponding to the digital), it is'necessary to transmit a middleimpulse over the tip conductor, and an early and a late impulse orcr thering conductor of the trunk employed.

While the sequence switch 229 was rotating through positions 6-1/4 to61-3/4, .the following impulses werev transmitted: .from ground,contact` 247, conductor 248, contact 419, conductor 416, over thecircuit previously. traced, through lthe lring conductor 137, thewirlding of relay 505, to grounded battery. In position 6-1/2 to GLS/.4,a'cir'- -cuit is completed from. ground, contact 249, conductor 250,contact 420, conductor 418, over the tip conductor 138, through thewindings of the relays 506 and 510, to

515, contact 519, conductorV 520, left-handwinding of the relay a, outerleft-hand armature and back Contact -of relay 0 to grounded battery.Relay a is energized in this circuit and establishes a vlocking circuitfor itself which may be traced from groundedbattery, outerleft-handcontact and armature or relay c, both windings of the relay ain series, right-hand inner front contact and armature of the relay a,conductor 539, contact 518, to ground. While the middle impulse is beingtransmitted the relays v505,506 and 510 are energied, resulting in anenergizing circuit from ground, left-hand armature and front contact vofrelay 503, conductor 504, armature and front contact of relay 505,armature and vfront, contact of relay 510, conductor 513, contact 524,oo nductor 525, left-hand winding of the relay b,

outer left-hand armature and back contact of relay c, togroundedbattery. The relay 7, attracts its armatures and completes-1 a lockingcircuit for itself from grounded battery, outer left-hand armature andback con` tact of the relay c, both windings ofthe reb in series,right-'hand inner upper contact and armature ot relay b, to ground overconductor 539 as previously -describedf In response to the late impulseonly the relay 505 is energized. As a result of this a circuit iscompleted from ground, left-hand armature and front contact of relay503, .con- -ductor 504, armature andfront contact of relay 505, innerarmature and back contact of relay 506, conductor 515, contact 519, conyductor 520, outer left-handarmature and front contact ofl relay I),left-hand winding of relay c, to grounded battery.v The relay attractsits armatures', thereby establishing a locking circuit for itself andalso interrupting the circuitsof relays a and b. These impulses have.been suilicient to select the `lamps S and 9. It is now necessary totransmit impulses to select the lamp 9. On not- -ing the code impulses,it will be 4seen that since the'number 9 is an odd number and occurs inthe second five hundred of the odd thousands, that an learly, middle andlate impulse are transmitted over the tip rconductor, and that a middleimpulse is transmitted over the ring conductor of the selected trunk;These impulses are transmitted in accordance withv theI translationwhich takes place in the registers, as will be indicated yby tracing thefollowing 'circuits While the lsequence switch 229 isrotating throughpositions 7f3/4 tol 8%1/4, the following impulses are sent: from ground,contact 253, conductor 254, contact 451, conductor l 418, over the tipconductor, throughthe windings of relays 510 and 506 to grounded ibattery; While the sequence switch 229 was i rotating through position 8to 8-1/4, acircuit was closed from ground through contact 255,'conductor 256, contacts 423,424-, con.

duc-tor'4l6 over'the ring conductor, winding the' sequence switch 229 isrotating through of vrelay 505, to grounded battery; and while 422,conductor 418 over the tip conductor, V

Vwindings of relaysv 5 10 and 506, to ground. Inresponse totheear1yimpulses, the re. lays 506 and`510 are energized, but the relay 505is denergized. Therefore no energizing circuit is completed for therelays co11trol ling the thousands indication'. vIn response tothe-middle impulses, the relays 505, 506

and 510 are' energizedvas a resultof which circuit' is completed fromground, left-hand 'armaturel and front contact of relay' conductor 504,right-hand armaturel front contact of' relay 5.05, armature frontcontact 'of relay l510, conductor l contact 526, conductor 527,windingmof the and and 513.:

'relay 52 to grounded battery. The relay b2 attracts its armatures andcompletes a lokfj ing circuit for itself from grounded battery` bothwindings of the' relay b2`in serles, inner 'right-hand front contact andarmature otim Vthe relay b2, te groundover conductor 539, as previouslydescribed. In response to the llate impulse, only the relays 506 and 510are 510 have their armatures retracted and interrupt the operatingcircuit of the magnet of sequence switch 500 to move the sequence switchinto position 9. In' position 9 the impulses controlling the selectionof the units lamp are transmitted. ln' the case assumed, the units digitis No. 7 and an early, middle and late impulse are transmitted over-thetip conductor, and the middle impulse is transmitted over the` ringconductor. Since no early or late impulses are transmitted over the ringconductor, the

relay 505 is 4not energized and completes no energizing circuit foroperating the relays controlling the lighting of the units lamp.However, middle impulses are transmitted over the tip and ringconductors to energize.

the relays 505, 506 and 510. Under these conditions a circuit is closedfrom ground,

left-hand armature and iront contact of relay 503, conductor 504,armature and front Contact of relay`505, armature and front.

Contact of relay 510, conductor 513, contact 538, left-hand winding ofthe relay B', outer left-hand armature and back contactof the.

relay C', to grounded battery. At the close of this series of impulses,the relays 505, 506

and 510 are denergized. As a result of this, the energizing circuit ofthe magnet of the sequence switch 500 is interrupted, -causing thissequence switchto vmove into position 10. A circuit for lighting the No.9

. thousands lamp maybe traced from grounded battery, at the lowerleft-hand corner of Fig. 5, conductor 540, contact 541, conductor 542,outer left-handarmature and back contact of relay a2', innerleft-handarmature and backcontact of relay b, outer right-hand armaturead back contact ofrelay a, inner lefthand armature and front' contact ofrelay c,

through theA No. 9. lamp, outer right-hand front contact and armature ofrelay c, con ductor 543, contact 544, to ground. The circuitfor .the No.9 hundreds lam pleted from grounded battery, con uctor 540,

' Contact l545, conductor 546, through the No.9

lamp, inner left-hand front contact and armature of relay-c outerright-hand back contact and armature o f relay a', inner left-hand backcontact .and armatureof the relay 5', linner right-hand frontcontact andarmature .of the relay b2, which isnow energized, conductor 539,eonta'ct518, tofgiound. While the sequence switch 500 is rotatingthrough is com-l i positions 9 and 10,-the hundredsand units lamps arelighted. It Will be remembered'- that the following relays of Fig.' 6have been actuated and locked up: relays C1, A, B2 and B. With theserelays actuated, a circuitis closed from battery, conductor 540, contact547, conductor 548, through lamp 8,

inner left-hand front contact and armature of relay C10, outerright-hand back contact and armature of relay A1", inner left-hand backcontact and armature of relay B10, in- 'Y ner right-hand front contactand armature of relay A2, conductor 539, contact 518 to ground. switch500, a circuit is completed from grounded battery, conductor 540,Contact 549,-conductor 550, lamp`7, inner left-hand armature and backcontact of relay A', inner left-hand armature and front contact of relayB', inner right-hand front contact and armature of relay B2, conductor539, contact 518, to ground.

It4 should here be noted'that asv soon as In position 10 of the sequencesequence switch 229 rotates through its various positions to position'1, a circuit 1s completed from grounded battery, magnet of sequenceswitch 100, 'contact 150, terminal 273, brush 274, contacts 275 and 276to ground, to move this sequence switch into posinon 16, 1

As soon as the sequence switch 100 moves outof position 11, thelocking'v circuit for the relayl 206 is interrupted. Relay '206deenergizes and completes a circuit for moving Y thesequence switch 200out of position 8 and into position 18. This circuit may be traced fromgrounded battery, magnet of sequence switch 200, contact 260, left-handback-con` tact and armature of relay 206, to ground.

In position 18 a circuit lis completed for the down-drive magnety26l,which is established -from grounded battery, winding -ot' 1thedown-drive magnet 261, Contact 262, to ground. Under the control. of thedowndrive magnet, the cord finder switch is restored to its normalposition, in which normal positions. circuit is completed from groundedbattery, magnet of sequence switch 200, contact 263, normal contact 264to ground, to move the sequence switch into position 1. 'I

The operator, on noticing the number.- of the desired line set up on thecall indicating lamps, inserts a plug 316 into the jack 317 of the partyline over which the desired subscriber can' be reached and releases .key311. The release of this key causes the restoration of the numberindicating apparatus and causes the denergiz-ation of relay 301. Relays300 and 302 become energized and attract their armatures. As soon astheplug 316 is inserted into theljack 317, arirru-.it yis completed fromgrounded battery, through the lamp 306, lWinding of the relays `30S),31S, sleeve of plug 316, sleeve of jack 317, winde round. The relays 303fiS-ettrect ihei armatures. As 'soon es 'the rele-y 309 attracts itsyermetures, 2t cirev prepared for the relay 320, which exs' fromxgrounded battery, Winding of the fr ey 3%,"iirnieture end beek Contactof re f' beck contact. and armature of relay leiner ieithend frenicontest and urine- '..ure Aof relay 339, conductor 303, armature undcontact of relay 302 to. ground through reiays 339,' 318 and Ehe relay3207is energized in'this circuit and attracts its urinat" 'hc circuitcompleted through relay 3 *muts and eutinguishesthe lamp 303.

eously with the ener'girtetion ci reef), the reizt-y 303 is actuatedover cir-l trf-.ceeble frein sf,rounded buttery, Windor". rele-y 333,inner fermeture and, front .uur ci reiey 3l@ ereley resistence 3&0., to2 euml. The relay 303 attracts its arme The rel-ey it ill he remembered,

emergieedv over e circuit closed frein buttery, Winding; of relay 323,con r e5, the lower ermatureand trou ct ot relu): 3M, conductor 3%,resisti, right-hend-ro .-t contact enel ermeture of reiey Q, cuterleft-hand front conern-reirme of relay A, cuter iei't-hend ifermeture oirel'ey B, eer

The relay 32e is en- 'to ground.

y, vwiudin,4.15 of relay, consi', outer upper armature end ircnt` t ci3m, conducta? 323, enter ici iront Contact and armature of reoireley E,contact '2,\to ground. relays, es 'they were energized, clzc. ue throughcontactspiiug 329, 523, resistance 52%, contact 521 f secu es the rela-y303 ettrect s the following locking cirei, ed for those previousiytraced fer the relays and 321i. The lockc-ircuit of" is traceable tromgrounded battery, u" Kling; of relay lefthend armature und ironteontact'cf this reley, contact spring right-hand armature end irontcontact orreiey 303,to ground. of the relay extends 'winding oi relayein-l iront Contact fie ill

' The iociging eircui't from ,grounded battery, 324, right-hundurpmi-ure l of relay Sie, contact spring armature of' the reiuy 303, toground. l

in order to prevent ringing oi station set oi e. suiiscri smi-d parte*'when "the eer'rcdaiuto guck 317, interrupting I device '330 is;provided, 'This interrupter is oi the u'ell'iruown type 'which-consistsof' e. couatly rotating shui? on which there are secll'the (lisl 3l r2:md 333. The disks und 333 :are insulated from the 'shutton which theyin und ere provi with brushes which their periphythe sul@ Iig 3&3 isheine; in-

e circuit completed from.

' relay 323, left-hand front cuter left-)hand frontcontuct 1and er pretus of the er other than the de nemesi erics. The periphery ofthe disk331, with the' exception 01"' e, very smell portion. is covered with aninsulating lnm-teriel. The con ducting portion is so positioned withrespect the conducting; portions of the disks 332 sind 333 that while acircuit is completed through the disl: 331, no circuit is completedthrough the disks and The purpose of this adjustment will be hereinafterdescribed.

After the insertion 'of the plug 316 into the jack 317 and after theenergization of the relay 3.18, as Soon as the brush of the disk 331`encounters its conducting Segment, e circuit iscompleted from groundedbattery through. the disk 331 and its brush, through the Contact andconta-ct spring 334, through the Winding 'of the relay 335, lowerermeture of the relay 318, Contact spring 336, right-hand contact andarmature of relay 324, to ground at contact spring 329 and armature orelay 303. The reltty 335 attracts its armature and completes e circuitfrom grounded buttery through. the contact/s ring 334;, over the circuitjust described. r Vhen from the positive source o'fringing current f 337332i left-hand Winding of the relay 332, right-hand front contact andarmature of contect and armature of rela-y 335, upper iront Contact andarmature of relay 320, upper armature and upper contact of relayv3l8,ti'oi plug 316, tip of jack 317, through the su station a pedesiredsubscriber, ring o the jack, ring of the plug, lower armature and frontContact oi the relay 320, lefthand armature und front contact of relay324 tov 'ground The relay 322 is marginal and does ynot attract itsarmatures until the celled sub scriher has answered. When the relay 322.

.is energized, the relay 321, which was shunted, attracts its armature'and completes a circuit from grounded battery, alrmetur'e und frontContact and winding of the relay 321, outer lefthend Wtrout contact andermatureoi rela-y 339, armature and front contact ofrelay 302, windingsof the relays 309, 313and 319, to ground. The relay 321 locks itself upin this circuit and prevents the reapplicetion of ringingI current durinthis cell. When the A operator restores t e selector switch 119 onnoting that the calling party has terminatedthe conversation,Vsupervisory lamp 306 operates in the Welllrnown marmer to inform the Boperator that the call has termineted, whereupon She remoyes plug 33.6from jack 317 to dener- ,qize the relays 309, 3l3 und 319. The relay309, in denergizing, causes the deenergization of relay 303, and thisrelay interrupts 'the locking circuit'of the relays 323, 324 and'conducting portion Aand brush o'vdisk i ico.

Relay 33S prevents a second series of=` impulses from actuating the callindicating apparatus until the B operator has removed the plug 316- fromthe jack 317.

`When the B operator released key 311 the relays 301 and 503deiiergized. Relay 301, 3n` retracting its armatures, extends thetrunkfcoiiductors 137 and 138 to the` called substation. Relay 503 onreti-acting its ar matures completes an interrupting circuit ior movingits .sequence switch 500 to position 1. This is completed from groundedbattery,winding of the magnet of the stepv,

sation the actuation of the supervisory re- Y 107. Iii-position 18 thedowndrive magnet lays 170 and `171 operates in the Well-known mannertoinform the A operator that the call has terniinated.' She thereuponremoves the plug 10i from the jack l 105, 'which causes the relays 106and 107 to retract their y armatures.4 ri"his completes a circuit formoving the sequence switch 100 out-of rposition 1G and into position 18.e This. circuit 'may be traced from grounded battery, wind ing of magnetof sequence switch 100, contact 140, armature and back contact of relay141 is operated inthe Wellfknown'manner to restore the selector switch119 to its noimal position. When the switch is restored, a circuit iscompleted from ground, commu- Ace tato'r brush 121, segment 142, contact144, magnet of sequence switch 100, to grounded u u a o i battery tomove this sequence switch into itsl normal position.

lVhat is claimed is: 1. In a telephone system, an incoming line.outgoing lines, a plurality of substai tions connected to'said outgoinglines, a 'signal associated with each of'said substations, an automaticswitch for interconnecting said incoming line and said oiitgoiug lines,means for directively operating said switch, an impulse transmittingmechanism arranged to transmit impulses of various `characteristics,sources oi' signaling current of various characteristics for operatingsaid signals, and mechanism responsive to said impulse' transmittingdevice tor selecting the lesiiei i ,soiii'ce of signaling current.

2. In a telephone system, au incoming line, outgoing lines, a pluralityof substatioiis coiiiieiited to said outgoing lines, a signal associatedwith erich of said substations,

an automaticv switch for interconnecting said incoming line andsaidfoutgoing lines, means y for operating said switch", a` directivelyoperated impulse transmitting device arranged to transmit impulses ofvarious characteristics, sources ofv signaling current, and

mechanism responsive to impulses from said impulse transmitting devicefor applying proper signaling current to actuate. the signal atthedesired substation.A

3. In a telephone system, anincoming line,`outgoing lines, a pluralityof substations connected to said outgoing lines,` a signal associatedwith each ofsaid substations, an automatic switch for interconnect-l-ing said incoming line and said outgoing l1nes, means for operatingsaid switch, an

impulse transmitting device arranged to be connected to said incomingline and to'tra'nsmit impulses of' various characteristics thereover,sources of signaling current vof varying characteristics, mechanismrespon- Asive to impulses from said impulse trans"` mitting device forselecting thedesired signalin current'. s I U 4. n atelephonesystem,'anl incoming line, 'outgoing lines,.a plurality oisubstatlons connected to said outgoing lines, a

Si nal associated with each substatioma switi for interconnectingjsaidincoming line and' said outgoing lines, means for operating said switch,an impulse transmitting device for transmittingimpulses varying inorder, number and duration, sources of signaling current of variouscharacteristics, and

mechanism responsive to said impulses for selecting the desiredsignaling current,

i5, In a signaling system, 'a device for transmitting impulses ofvarious characterv istics, sources of current of variouscharacte'ristics, a*plurality of signals each responsiveito current-of acertain character, mechanism responsive to said impulse transmit-j'- nting device for selecting current vfrom the i proper source to actuate adesired signal.

6. In a signaling system, a variably operable device for transmittinglong and short impulses, a plurality of signals each responsive tocurrent of a certain character, sources of current for actuating saidsigi'ials, `and means responsive to impulses from said impulse'transmitting device for .selecting the proper source of current foractuating the desired signal. y

7. In a telephone system, an incoming line,

outgoing lines, a plurality of substations connected to said outgoinglines, a signal associated with each of said substations, means forinterconnecting said incoming line with any of said outgoing lines, .anumber indicating" device for indicating the numbei' of the desiredline, sources of current of various characteristics for actuating saidsignals, a device for transmitting impulses oic various characteristics,and means responleo shall be operated.

ferent characteristics,

number indicating device to indicate the desired number.

.8. In a signaling system, signals arranged in groups, a groupv of threevarious `combinations to select a group of signals, and a second groupof relays arranged to be selectively operatedto determine which signalof the selected group Y 9. In a signaling system, ten signals arrangedin groups of two each, a group of three relays arranged to beselectively actuated in various l combinations to select a group ofsignals, and two relays arranged to be selectively operated to determinewhich signal of the selected group shall be operated. 'f

10. In a telephone system, an operators osition, a number indicatingdevice thereat, ines terminating at. said operators position, aplurality of stations on each of said lines, sources of current ,ofdifferent characteristics, a signal at each of said 'stations responsiveto current of a particular characterstic, and directively operable means.at a distant point to transmit impulses of different characteristicsfor operatingv said number indicating' device and for applyin the propercurrent to adesired line to signa the Wanted station'thereon.

11."In a telephone system, an operators position, a variable operablesender at saidposition for transmitting impulses of difa secondoperators position, party lines terminating vthereat,

'means for interconnecting said@l positions,

and a party line signaling mecllhnism and a number indicatin devicelocated at said last mentioned position, yeach being selectivelyresponsive to impulses. from said sender.

12. In a telephone system, an incoming line, outgoing arty lines, meansfor interconnecting'saicl) incoming line' with any of said youtgoinglines, a number indicating device associated with said lines,registering mechanism forselectively controllin sai indicating device,ymeans for 'selective y signaling said party line, and means operable ata distant point for transmitting impulses of various characteristics t0selectively operate said registering mechanism and said signaling means.

13. In a telephone system,I anincoming line, outgoing party lines, meansfor interconnecting said incoming line with `any of said outgoing partylines, anumber indicating device associated with said outgoing lines,registering mechanism comprising a signaling said party a plurality oflLeiarei irou of relays Ior selectively controlling said indicatingdevice, means for selectively lines, and an impulse transmitting devicefor transmitting impulses of various characteristics to selectivelyoperate said registering mechanism and said u signaling means. relaysarranged to be selectively actuated 1n 14. In a telephone system, anincoming line, outgoing (party, lines, means for interconnecting saiincoming Aline with any of said outgoingparty lines, a number indicatingdevice associated with said outgoing lines, registering mechanismcomprising groups of relays arran ed to be selectively actuated invarious com vselectivel signaling said party lines, and an impu setransmitting device for transmitting impulses of various characteristicsto selectively operate said registering mechanism and said signalingmeans.

15. In a telephone system, incoming lines, outgoing party lines, meansfor interconnecting any incoming line with any outgoing line, a devicefor indicating the number of certain of said lines, signaling said partylines, and-a sender for transmitting impulses of various characteristicsto selectively actuate said number indicating device and said signalingmeans.`

' 16. In a telephone system, an operators position, a sender at saidposition for trans mitting impulses of various characteristics,

a second operators posit-ion,"party lines terminating thereat, means forinterconnecting said positions, and means at said last mentionedoperators position for selectively signaling saidA party lines, Asaidsignaling means being responsive said sender. l

17. In a telephone. system, an operatorsA position?, a sender at midposition for transmitting long and short impulses in variouscombinations, a second onerators position,

arty lines terminating thereat, means .for interconnecting saidpositions, and means at said last mentioned operators position forselectively signaling said party lines, said signaling -means beingresponsive to im. pulses from said sender.

18. In combination, means orproducing.

inations, means for means for selectively to `impulses from series ofimpulses of various characteristics,

mechanism to be controlled, operating-cir'- 'cuits for said mechanism, amulti-position switch of the sequence Aswitch type, said switchcontrolling in its various positions certain'of said operating circuits,and means vresponsive to a series of impulses for opferating saidswitch..

In witness whereof, we hereunto subscribe our names this 29th day ofMarch,

' ALBEN n'LUNDnLL EDGAR H. CLARK.

